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の速さで

at a speed of

→ の
phrase Rare #45,273
at a speed of Used to describe the speed at which someone or something moves or does something.
JA: この車は時速100キロの速さで走ります。
EN: This car travels at a speed of 100 kilometers per hour.

彼女はお兄さんと同じ位の速さで泳げます。

She can swim about as fast as her older brother.

この電車はどれくらいの速さで走るんですか？

How fast does this train go?

彼はどのくらいの速さで走りますか。

How fast does he run?